Looking quite slim and keeping it PG for the kids, Aguilera performs in front of the Sleeping Beauty Castle after launching the 'Happiest Celebration on Earth' during the Disneyland 50th Anniversary Celebration at Disneyland Park in 2005.

Singer Christina Aguilera performs in concert at the Coca-Cola Dome ahead of the F1 GP Masters race in Kyalami on November 10, 2005 in Johannesburg, South Africa. Sorry Tina, just because you're wearing a coattail doesn't make it classy.

U.S. pop diva Christina Aguilera strikes a pose reminiscent of her "dirty" days during the shooting of a global Pepsi commercial. The campaign featured Aguilera in a number of exotic locations, and allowed fans to download a personal performance of their choice.

Christina Aguilera, awkwardly raunchy for a pregnant woman, poses for a picture on the red carpet at the nationwide launch of Rock The Vote 2008 held at Kitson in November of 2007, in Beverly Hills California.

Looking a little fuller in the cheeks, Aguilera attends the Sony Pictures Classic 68th Annual Golden Globe Awards Party held at The Beverly Hilton hotel on January 16, 2011 in Beverly Hills, California.

With awful hair-coloring distracting from her recent weight fluctuation, Christina Aguilera speaks onstage during the 40th Anniversary American Music Awards nominations press conference in October 2012 in Los Angeles, California.

Aguilera performs onstage during the 40th American Music Awards held at Nokia Theatre L.A. Live in November 2012 in Los Angeles, California. But who can focus on her with the female body builder in the frame...

Singer-songwriter Christina Aguilera understands the power of a little black dress as she attends the 2013 Time 100 Gala at Frederick P. Rose Hall, Jazz at Lincoln Center on April 23, 2013 in New York City.